#include<bits/stdc++.h>
using namespace std;
int a;
char b;
int c;
int main(){
	cin>>a>>b>>c;
	if(a<10) cout<<0;
	if(a>=6) cout<<a<<b<<c;
	else cout<<a+24<<b<<c;
	if(a<10 )
	return 0;
}